$FCB8/64696: Set IRQ Vector
Jump from $FC86:
FCB8: 20 93 FC JSR $FC93 ; Restore Normal IRQ
FCBB: F0 97 BEQ $FC54 ; IRQ Entry Point
Jump from $F8A1, $FC65, $FC7E:
FCBD: BD 93 FD LDA $FD93,X ; Initialise System Constants
FCC0: 8D 14 03 STA $0314 ; Vector: Hardware IRQ Interrupt Address
FCC3: BD 94 FD LDA $FD94,X ; Initialise System Constants
FCC6: 8D 15 03 STA $0315 ; Vector: Hardware IRQ Interrupt Address
FCC9: 60 RTS
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